Had enough

I have been trying to cancel my contract for 2 months now and been informed to phone on the 1st April to cancel otherwise I will be charged a cancellation fee. so today the 1st of April I phoned to cancel my contract. the consultant told me they will debit my account on the 1st of June for the last time. I asked why if I am cancelling now? I received no reply and asked are you just going to ignore me???? he said Yes! can you believe that?! and then he didn't want to put me through to someone else and made out he couldn't hear me. I do not want airtime on my phone in May as I am CANCELLING MY CONTRACT! I understand that a debit order must go off on 1 May for Aprils usage but that is it. Please sort this out